These files contain some predefined skies for you to use in your scenes.

skies.inc: There are textures and pigment definitions in this file. All pigment definitions start with
"P_", all sky_spheres start with "S_", all textures start with "T_", and all objects
start with "O_".

stars.inc: This file contains predefined starfield textures. The starfields become denser and more colorful
with the number, with Starfield6 being the densest and most colorful.